Image forming apparatus

摘要

An image forming apparatus includes an image carrier that carries an electrostatic latent image; a developer supplying unit that supplies developer by being driven at a predetermined speed; a developing unit that develops the electrostatic latent image, while a transporting member transports the developer, a transport speed of the transporting member being switched to a plurality of speeds; a determining unit that determines whether or not an operation where a supply capacity of the developer supplying unit is greater than a transport capacity of the developing unit exceeds a predetermined threshold value and is continued; and a controller that performs control so that, when the determining unit determines that the operation exceeds the predetermined threshold value and is continued, an operation that was being executed immediately prior to the determination is stopped to forcefully drive the transporting member of the developing unit for a predetermined driving time.

主权项

1. An image forming apparatus comprising:
an image carrier that carries an electrostatic latent image; a developer supplying unit that supplies developer by being driven at a predetermined speed; a developing unit that develops the electrostatic latent image carried by the image carrier, while a transporting member transports the developer that is supplied from the developer supplying unit, a transport speed of the transporting member being switched between a highest transport speed and a lower speed lower than the highest transport speed; a determining unit that determines whether or not a first accumulated driving time exceeds a first predetermined threshold value, the first accumulated driving time being obtained by accumulating times in which the transporting member of the developing unit is driven at the lower speed; and a controller that performs control so that, when the determining unit determines that the first accumulated driving time exceeds the predetermined threshold value, an operation that was being executed immediately prior to the determination is stopped to forcefully drive the transporting member of the developing unit for a predetermined driving time and develop a uniform density image.